diff --git a/src/DotNetCampus.CommandLine/CommandLineParsingOptions.cs b/src/DotNetCampus.CommandLine/CommandLineParsingOptions.cs
index 251e93f..9c581f5 100644
--- a/src/DotNetCampus.CommandLine/CommandLineParsingOptions.cs
+++ b/src/DotNetCampus.CommandLine/CommandLineParsingOptions.cs
@@ -6,19 +6,39 @@ namespace DotNetCampus.Cli;
 public readonly record struct CommandLineParsingOptions
 {
     /// <inheritdoc cref="CommandLineStyle.Flexible" />
-    public static CommandLineParsingOptions Flexible => new() { Style = CommandLineStyle.Flexible };
+    public static CommandLineParsingOptions Flexible => new()
+    {
+        Style = CommandLineStyle.Flexible,
+        UnknownArgumentsHandling = UnknownCommandArgumentHandling.IgnoreUnknownOptionalArguments,
+    };
 
     /// <inheritdoc cref="CommandLineStyle.DotNet" />
-    public static CommandLineParsingOptions DotNet => new() { Style = CommandLineStyle.DotNet };
+    public static CommandLineParsingOptions DotNet => new()
+    {
+        Style = CommandLineStyle.DotNet,
+        UnknownArgumentsHandling = UnknownCommandArgumentHandling.IgnoreUnknownOptionalArguments,
+    };
 
     /// <inheritdoc cref="CommandLineStyle.Gnu" />
-    public static CommandLineParsingOptions Gnu => new() { Style = CommandLineStyle.Gnu };
+    public static CommandLineParsingOptions Gnu => new()
+    {
+        Style = CommandLineStyle.Gnu,
+        UnknownArgumentsHandling = UnknownCommandArgumentHandling.IgnoreUnknownOptionalArguments,
+    };
 
     /// <inheritdoc cref="CommandLineStyle.Posix" />
-    public static CommandLineParsingOptions Posix => new() { Style = CommandLineStyle.Posix };
+    public static CommandLineParsingOptions Posix => new()
+    {
+        Style = CommandLineStyle.Posix,
+        UnknownArgumentsHandling = UnknownCommandArgumentHandling.IgnoreUnknownOptionalArguments,
+    };
 
     /// <inheritdoc cref="CommandLineStyle.Windows" />
-    public static CommandLineParsingOptions Windows => new() { Style = CommandLineStyle.Windows };
+    public static CommandLineParsingOptions Windows => new()
+    {
+        Style = CommandLineStyle.Windows,
+        UnknownArgumentsHandling = UnknownCommandArgumentHandling.IgnoreUnknownOptionalArguments,
+    };
 
     /// <inheritdoc cref="CommandLineStyle.Windows" />
     [Obsolete("为避免理解歧义，已弃用此名称，请使用 Windows 代替。")]
diff --git a/tests/DotNetCampus.CommandLine.Tests/CommandLineStyleTestingExtensions.cs b/tests/DotNetCampus.CommandLine.Tests/CommandLineStyleTestingExtensions.cs
index 4a6673d..a21fc6f 100644
--- a/tests/DotNetCampus.CommandLine.Tests/CommandLineStyleTestingExtensions.cs
+++ b/tests/DotNetCampus.CommandLine.Tests/CommandLineStyleTestingExtensions.cs
@@ -2,16 +2,22 @@
 
 namespace DotNetCampus.Cli.Tests;
 
+using UH = UnknownCommandArgumentHandling;
+
 internal static class CommandLineStyleTestingExtensions
 {
     public static CommandLineParsingOptions ToParsingOptions(this TestCommandLineStyle style) => style switch
     {
-        TestCommandLineStyle.Flexible => CommandLineParsingOptions.Flexible,
-        TestCommandLineStyle.DotNet => CommandLineParsingOptions.DotNet,
-        TestCommandLineStyle.Gnu => CommandLineParsingOptions.Gnu,
-        TestCommandLineStyle.Posix => CommandLineParsingOptions.Posix,
-        TestCommandLineStyle.Windows => CommandLineParsingOptions.Windows,
-        TestCommandLineStyle.Url => CommandLineParsingOptions.Flexible with { SchemeNames = ["test"] },
+        TestCommandLineStyle.Flexible => CommandLineParsingOptions.Flexible with { UnknownArgumentsHandling = UH.AllArgumentsMustBeRecognized },
+        TestCommandLineStyle.DotNet => CommandLineParsingOptions.DotNet with { UnknownArgumentsHandling = UH.AllArgumentsMustBeRecognized },
+        TestCommandLineStyle.Gnu => CommandLineParsingOptions.Gnu with { UnknownArgumentsHandling = UH.AllArgumentsMustBeRecognized },
+        TestCommandLineStyle.Posix => CommandLineParsingOptions.Posix with { UnknownArgumentsHandling = UH.AllArgumentsMustBeRecognized },
+        TestCommandLineStyle.Windows => CommandLineParsingOptions.Windows with { UnknownArgumentsHandling = UH.AllArgumentsMustBeRecognized },
+        TestCommandLineStyle.Url => CommandLineParsingOptions.Flexible with
+        {
+            SchemeNames = ["test"],
+            UnknownArgumentsHandling = UH.AllArgumentsMustBeRecognized,
+        },
         _ => throw new ArgumentOutOfRangeException(nameof(style), style, null),
     };
 }